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Finding the Fourth Proportional to 128,143.80, 192,215.70 and 120,886.20

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Solution

The fourth proportional to 128,143.80, 192,215.70 and 120,886.20 is: 181,329.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,143.80 : 192,215.70 = 120,886.20 : x
  2. Step 2: Convert to fraction form
    128,143.80/192,215.70 = 120,886.20/x
  3. Step 3: Cross multiply
    128,143.80x = 192,215.70 × 120,886.20
  4. Step 4: Simplify right side
    128,143.80x = 23,236,225,553.34
  5. Step 5: Solve for x
    x = 23,236,225,553.34/128,143.80
  6. Step 6: Final answer
    x = 181,329.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.